[Restorer]

The population of Mexico City in the mid-18th century was around 170,000.

[Restorer]

Make that mid-19th century. No idea what it was 100 years earlier.

BTW, I recently finished Jeff Shaara's novel about the MExican War, Gone For Soldiers. Really interesting book.

The Mexican Army was mostly used to terrorizing peasants and Indians. They fought against a modern army about as well as the Taliban did.